Micro Direct
ATS Certification
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ATS (American Thoracic Society) Certification


We have received confirmation letters from the LDS hospital in Utah that the MicroLab, MicroLoop, and the MicroDiary have been validated to the latest ATS Spirometry Standards.


The LDS is the recognized independent testing center in America which undertakes validation to the standards for all manufacturers who submit their spirometers. The current standards are the ATS 1994 Standards. Many manufacturers claim conformity with ATS Standards and some can prove validation to 1987 ATS Standards. The difference is very important. The 1994 ATS Standards are more exacting and stringent than the 1987 standards, and require manufacturers to supply instruments which meet, apart from the 24 Standardized Spirometry Waveforms, a further 26 Peak Flow Waveforms and testing with heated and humidified air. Further validation is undertaken using human subjects



The Micro, MicroPlus, and MicroDL have been validated to 1987 ATS Standards. Since the MicroDiary meets 1994 standards and is of the same construction as the other spirometers in the Micro range, it can be accepted that these also meet the current standards.



The LDS hospital is the only recognized testing institution in the world for testing spirometers. This gives you assurance that our claims of proven accuracy are backed up by vigorous independent testing.

Click here to request reprints of the certification letters